The company must now end the conduct within 90 days or face penalty payments of up to 5% of the average daily worldwide turnover of Alphabet, Google's parent company.

The two core offences as noted by the European Comission are as follows:

From 2008, Google began to implement in European markets a fundamental change in strategy to push its comparison shopping service. This strategy relied on Google's dominance in general internet search, instead of competition on the merits in comparison shopping markets:

Google has systematically given prominent placement to its own comparison shopping service: when a consumer enters a query into the Google search engine in relation to which Google's comparison shopping service wants to show results, these are displayed at or near the top of the search results.

Google has demoted rival comparison shopping services in its search results: rival comparison shopping services appear in Google's search results on the basis of Google's generic search algorithms. Google has included a number of criteria in these algorithms, as a result of which rival comparison shopping services are demoted. Evidence shows that even the most highly ranked rival service appears on average only on page four of Google's search results, and others appear even further down. Google's own comparison shopping service is not subject to Google's generic search algorithms, including such demotions.

As a result, Google's comparison shopping service is much more visible to consumers in Google's search results, whilst rival comparison shopping services are much less visible.

Much like Apple's and Ireland's illegaltaxdeal, fines like this can be easily avoided: respect the laws regarding doing business in the EU. I don't expect the current (or the previous, for that matter) US administration to keep these incredibly powerful tech giants in check, so I guess it's up to the EU.

You make it sound like it is a UK decision to withdraw or not from the EU on March, 31 2019... I'm afraid that's not the case, the remaining EU members *could* extend this period. UK has no say and could be de facto out of EU on March, 31 2019. Hence I'm saying that Article 50 embeds a 2-year timebomb, which is the only timescale known at this time...